Metalurgia do pó _ Sinterização

METALURGIA DO PÓ ESCOLA TÉCNICA SENAI PLÍNIO GILBERTO KROEFF Centro Tecnológico de Mecânica de Precisão  – CETEMP Curso Técnico de Mecânica de Precisão Disciplina de Produção Mecânica  – Outros Processos

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METALURGIA DO PÓ HISTÓRICO • 3000 AC - Egito  – Armas de aglomerado de pó de Ferro • 300 DC - Índia - Coluna de 6,5 t de pó de Ferro reduzido • 1800’s - Consolidação do pó de Platina por trabalho a quente Rússia e Inglaterra • 1905 - Filamentos de Carbono (4 lumens/W) 1910 - Filamentos de •

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METALURGIA DO PÓ O MERCADO DA METALURGIA DO PÓ • • • •

Ligas de Ferro com grande precisão e elevada qualidade estrutural Materiais de difícil processamento, com alta densidade e microestrutura uniforme Materiais com elevado ponto de fusão Ligas especiais de materiais compostos

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METALURGIA DO PÓ SINTERIZAÇÃO

 A sinterização é um processo no qual pós, uma vez compactados, recebem tratamento térmico, no qual a temperatura de processamento é sempre menor que a sua temperatura de fusão. Durante o processo ocorrem várias reações no estado sólido do elemento, que são ativadas termicamente. Este processo cria uma alteração na estrutura

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METALURGIA DO PÓ QUEIMA E SINTERIZAÇÃO QUEIMA: tratamento térmico a que são submetidos produtos a verde, para desenvolver microestrutura e propriedades desejadas. Divide-se em 3 estágios:  – Reações preliminares  – Sinterização •

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METALURGIA DO PÓ REAÇÕES PRELIMINARES • • • •

Secagem Vaporização de água combinada Decomposição de materiais orgânicos Pirólise (termólise) de aditivos orgânicos

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METALURGIA DO PÓ CONSOLIDAÇÃO E SINTERIZAÇÃO •

Consolidação implica que dentro do produto as

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METALURGIA DO PÓ SINTERIZAÇÃO - TIPOS: NO ESTADO SÓLIDO (SSS): Somente partículas sólidas e poros. Ex.: Al2O3 + 0,5% MgO; ZrO2 + •

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METALURGIA DO PÓ PROCESSO DE FABRICAÇÃO 1ª ETAPA: OBTENÇÃO DO PÓ Métodos: Atomização, Moagem ou Eletrólise

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METALURGIA DO PÓ PROCESSO DE FABRICAÇÃO 2ª Etapa: COMPACTAÇÃO

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METALURGIA DO PÓ PROCESSO DE FABRICAÇÃO 3ª Etapa: SINTERIZAÇÃO

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METALURGIA DO PÓ

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METALURGIA DO PÓ

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METALURGIA DO PÓ

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METALURGIA DO PÓ

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METALURGIA DO PÓ

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METALURGIA DO PÓ QUESTIONÁRIO 1  – De quando datam os primeiros registros da utilização de materiais sinterizados? 2  – Cite os principais produtos industrializados pelo processo de sinterização. 3  – Descreva sucintamente o que acontece com os pós, no processo de sinterização. 4  – O que é o pó compactado verde? 5  – Quais são as reações preliminares que ocorrem no processo de queima? 6  – Defina a consolidação do agregado.